Gender Determination

Have you ever wondered why you were born a boy instead of a girl - or a girl instead of a boy? As Tim and Moby explain in this BrainPOP movie on gender determination, the answer lies in your DNA, the chemicals inside you that contain a “blueprint” for your body. You’ll learn all about the long strands of DNA called chromosomes, including what X and Y chromosomes are, why sperm and egg cells only contain half a set of chromosomes each, and how your gender is determined at the moment of fertilization. So if you need to know why you are the way you are, check this movie out!